OMAHA, Neb. (AP) — The University of Nebraska at Omaha says security has been increased after a student reported being sexually assaulted by a man in her dormitory room.

The university sent students an email saying a student at the Scott Village resident hall reported the assault Tuesday morning. In the email Tuesday night, the university says the student didn’t recognize the man and it’s unclear how he entered her room.

Omaha police are in charge of the investigation. Omaha police and UNO security have increased their presence on campus.

Students are asked to lock their doors, secure windows and make sure they know who’s at the door before opening it.